Sean Carroll at Preposterous Universe:
A “Theory of Everything” is physicists’ somewhat tongue-in-cheek phrase for a hypothetical model of all the fundamental physical interactions. Of course, even if we had such a theory, it would tell us nothing new about higher-level emergent phenomena, all the way up to human behavior and society. Can we even imagine a “Theory of Everyone,” providing basic organizing principles for society? Michael Muthukrishna believes we can, and indeed that we can see the outlines of such a theory emerging, based on the relationships of people to each other and to the physical resources available.
More here.